STOLON FORMATION IN SPEUIES OF TR YPANOSYLLIS. 439 
by no means uncommon in the Syllids; but it is interesting 
to find it in so specialised a case as this. 
Reproduction in Teypanosyllis Ingens. 
In the single specimen of T. ingens (3^ pp. 296-302) the 
stolons had nearly all been detached during preservation. It 
is stated that their place of origin is not termiualj but about 
twenty somites from the posterior end. No generative pro- 
ducts were found in the stocky but Johnson thinks that they 
are pi’obably developed in the parental somites posterior to 
the budding zone.” It seems likely, from these data, that 
T. in gens conforms to the type of reproduction found in 
T. gemmipara, a genital appendage being formed about the 
same time as the stolons. 
The most noteworthy point which appears in Johnson’s 
description is the higher development of the stolons com- 
pared with those of T. gemmipara and crosslandi. This 
is expressed in the occurrence of (1) a “minute median 
tubular structure,” which Johnson 'interpreted as a rudiment 
of the alimentary canal, and (2) a dorsal and ventral blood- 
vessel (but no lateral vessels). Tiiese are important differ- 
ences, but in Johnson’s drawing it is not made clear that the 
“rudimentary gut” is lined by a definite epithelium, and 
uidess this is so there is no leal difference between this 
structure and the mesoblastic residual strand in the stolons 
of T. gemmipara and T. crosslandi. The presence of 
blood-vessels, too, needs confirmation in a better-preserved 
specimen. 
General Considerations. 
In the papers of Johnson the phenomenon here described 
is referred to as collateral budding, and this nomen- 
clature has been followed by Izuka and myself. I wish, how- 
ever, to state my grounds for maintaining this term, which 
are possibly different from those -which led Johnson to adopt 
it. In the specimen examined by him the area of prolifera- 
tion has a markedly lateral position, occurring, indeed, on a 
